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  4. Which one of the following substances has the highest proton affinity?

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Q. Which one of the following substances has the highest proton affinity?

Uttarkhand PMTUttarkhand PMT 2007

Solution:

$ NH_{3} $ is more basic due to more tendency of $N$ to donate its lone pair (having lower electronegativity) than $ H_{2}O $ . Hence, it has the highest proton affinity.